HTML 背景附件：已修复。滚动后背景被遮盖

Question

我主要是想创建一个背景图像，让它永远固定在原位。但是，似乎如果 div 内部的内容太多并且我向下滚动，图像仍然保持固定但我向下滚动得越多就会变成 "covered" 。

View at the very top of the page looks totally fine After scrolling down a little, the background starts to get covered (you can see the image is still fixed in position)

代码片段如下。我在内部 div 添加了大量新行来显示问题

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Bootstrap 4 Example</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
    <style>

        html, body {
        height: 100%;
        margin: 0;
        }
        .bg{
        height: inherit;
        background-image: url("images/background.jpg");

        background-position: center center;
        background-repeat: no-repeat;
        background-size: cover;
        background-attachment: fixed;
        }

    </style>
</head>
<body>
<div class="bg">
    <div class="container">
    <h1>My First Bootstrap Page</h1>
    <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>LOL</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
    </div>
</div>
</body>
</html>

Answer 1

删除html, body中的height 100%并删除.bg中的height: inherit;。那应该可以。

Answer 2

您需要将 overflow:scroll; 添加到 .bg class

bg{
    height: inherit;
    background-image: url(http://placekitten.com/200/300);
    background-position: center center;
    background-repeat: no-repeat;
    background-size: cover;
    background-attachment: fixed;
      overflow:scroll;//new selector added
    }

见Live preview

Answer 3

检查这个只需将 class "bg" 给 body 而不是 div

或直接添加

overfloaw:scroll

在背景中class

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Bootstrap 4 Example</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
    <style>

        html, body {
        height: 100%;
        margin: 0;
        }
        .bg{
        height: inherit;
        background-image: url("https://pbs.twimg.com/profile_images/378800000017423279/1a6d6f295da9f97bb576ff486ed81389_400x400.png");
       background-size: cover;
       background-attachment: fixed;
       background-position: right top;
   
        }

    </style>
</head>
<body class='bg'>
<div >
    <div class="container">
    <h1>My First Bootstrap Page</h1>
    <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>LOL</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
    </div>
</div>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Bootstrap 4 Example</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
    <style>

        html, body {
        height: 100%;
        margin: 0;
        }
        .bg{
        height: inherit;
        background-image: url("https://pbs.twimg.com/profile_images/378800000017423279/1a6d6f295da9f97bb576ff486ed81389_400x400.png");
       background-size: cover;
       background-attachment: fixed;
       background-position: right top;
       overflow:scroll;
        }

    </style>
</head>
<body >
<div class='bg' >
    <div class="container">
    <h1>My First Bootstrap Page</h1>
    <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>LOL</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
    </div>
</div>
</body>
</html>

Answer 4

将您的背景图片添加到您的 body。

另一种解决方案是：将溢出设置到您的 .bg Class overflow-x:auto;

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Bootstrap 4 Example</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
    <style>

        body{
        background-image: url("images/background.jpg");

        background-position: center center;
        background-repeat: no-repeat;
        background-size: cover;
        background-attachment: fixed;
        }

        html, body {
        height: 100%;
        margin: 0;
        }
        .bg{
        height: inherit;

        }

    </style>
</head>
<body>
<div class="bg">
    <div class="container">
    <h1>My First Bootstrap Page</h1>
    <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>LOL</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
        <p>This is some text.</p>
    </div>
</div>
</body>
</html>

HTML 背景附件：已修复。滚动后背景被遮盖

HTML background-attachment: fixed. The background gets covered up after scrolling

html

css

background-image